I was estimating that 5 feet would be a minimum of interference, in trying to get the Cole onto her while she was submerged. But, fine, say bigger. Crossing the Atlantic on piggy back is what the floater was designed for, and as long as the weather was balmy, it looks like pretty easy duty once the cargo was lashed down. Gawd save them if the glass fell, though, because that thing doesn't look very kindly at all.